Manufacture of vat dyestuffs



as thenone of the melting point of s Annalen vol. heated with 5. parts by 40 which is treated with part of it is dissolved with a red color. Air

,46 rated from the alkaline lye.

} Patented June 10, 1924.

UNITED STATES, PATENT F E HAXIMILIAN r. scnmnrr AND ALFRED HAGENBBQKER, or BIEBRICH-ON- -THE-RHIHE,

- GERMANY,-

ASSIGNORS TO THE FIRM KALLE & co-.,-' nx'rmnensmmscmr, AT 'BmBmcH-oN-rnE-nmm, GEBMNY,

MANUFACTURE or VAT DYESTUFFS.

Ho Drawing.

is on p w 5. gi

where R-represents an alkylarylor aralkylgroup (substituted or not) may be converted zeinto valuable vat-dyestuffs by fusing them I with alkali.

These coloring matters dye especially cotton in different tints. The initial products may be obtained in general by treating so acenaphthenone with aldehydes.

Example 1 part by weight of benzylidenacenaph- (see 290, p. 204) are wei ht of-caustic potash to about 200-260 G. A ark melt of coloring matter is produced water. The greatest Grabe & J equier, Liebig is blown into the mass, whereby the dyestufi still existing as leuco-compound is completely precipitated. By filtration it is sepa- It is a black powder being reduced by alkaline hydrosulfite to a red vat from which the vegetable fibre is dyed dark-blue. In sulfuric acid it dissolves with a blue color.

employed in the above exampleother condensation products of acenaphthenone with other aldehydes maybe used, for instance chloro-, oxyor aminoaldehydes of the ben- 1 1. Process of producin 'vat-dyestufls con-' s1st1ng 1n fusing with a aline agents com- Instead of the benzylidenacenaphthenone Application filed November 20, 1923. Serial No; 675,935.

zene, naphthalene or anthracene series or aldehydes of the aliphatic series.

If for instance o-oxybenzylidenac'enaphthenone (obtainable from acenaphthenone and salicylaldehyde) is fused with alkali according to the foregoing example',-a coloring 60 matter in form of a blue powder is obtained dying cotton in bluish-gray tints giving a gray on treating with soap. The o-oxybenz'ylidenacenaphthenone crystallizes from glacial acetic acid in yellow needles melting at 186. In caustic soda lye it dissolves to an orange-yellow solution, from which it is precipitated by means of acids. In organic solvents, except ligroine, it dissolves readily.

We claim:

pounds of the following constitution where R represents an alkylarylor aralkylroup.

3. rocess of producing vat-dyestuffs consisting in fusing with alkaline agents the condensation products of acenaphtlenone with aldehydes. v

4., Process of producing vat-dyestuffs consisting in fusing with alkali hydroxide the 105 condensation products of acenaphthenone with aldehydes.

5. Process of producing vat-dyestufis con? sisting in fusing the condensation product of acenaphthenone' and benzaldehyde with alkaline .agents.

formula 7. As new prod I (EH R ucts the vat-dyestufis obline agents.

tainable by fusing the condensation products of acenaphthenone and aldehydes with alka- 20 8, As a new product the vat-dyestufi obtainz ble by fusing the condensation product of acenaphthenone and benzaldehyle with alkaline agents.

In testimony whereof we have signed our 25 names to this specification in the presence of two subscribing witnesses.

Dr. AUGUST RoTH, JANE QUEST. 

